DARWIN AND DESCENT. 225 



heritance still betraying their original birth-place " 



(P- 399)- 



Again : — 



" With respect to the distinct species of the same 

 genus which, on my theory, must have spread from one 

 parent source, if we make the same allowances as 

 before," &c. 



" On my theory " became " on our theory " in 1 869. 



Again : — 



" On my theory these several relations throughout 

 time and space are intelligible ; . . . the forms within 

 each class have been connected by the same bond of 

 ordinary generation ; ... in both cases the laws of 

 variation have been the same, and modifications have 

 been accumulated by the same power of natural 

 selection" (p. 410). 



" On my theory " became " according to our theory " 

 in 1869, and natural selection is no longer a power, 

 but has become a means. 



Again : — 



" / believe that something more is included, and that 

 propinquity of descent — the only known cause of the 

 similarity of organic beings — is the bond, hidden as it 

 is by various degrees of modification, which is partially 

 revealed to us by our classification " (p. 4 1 8). 



Again : — 



" Thus, on the view which I hold, the natural system 

 is genealogical in its arrangement, like a pedigree " 

 (p. 422). 



" On the view which I hold " was cut out in 



1872. 



p 



